Date of Award
Master of Science
Chemical and Paper Engineering
Dr. R.A. Miner
Dr. David Peterson
Masters Thesis-Open Access
Mass balances can quantify the dilution and thickening of a liquor/fiber suspension on a brownstock washer. However, the complex displacement process necessitates an empirical approach. Given empirical data, washers can be optimized through use of efficiency factors with mass balances.
Because empirical data is difficult to obtain, a laboratory washing method was developed to empirically generate displacement efficiencies on pulp under mill washer conditions. Reproducible data generated by this method resulted in a displacement/dilution function as seen on mill washers. A laboratory simulation using mill samples, exclusive of problems for one vacuum drum, resulted in comparable efficiencies with less than 10% error.
The relationship between dilution and displacement was examined with a system constant. System constants, which account for the inaccessible dissolved solids portion in the exiting mat, were determined.
Muller, Hugh E., "A Laboratory Simulation of a Rotary Vacuum Drum Brownstock Washer" (1987). Masters Theses. 1252.